Mono Passive Isolation Box (Mli1) By Samson. Product Details The Samson MLI1 is a line level passive isolation box designed to remove hum and buzz caused by ground loops, as well as to convert unbalanced signals to balanced signals for long cable runs. Combining premium sound circuitry with durable, roadworthy construction, the MLI1 provides high-quality signal connection solutions for live, broadcast and studio applications. Frequency Flatness The MLI1 features Samson's STL transformer that delivers an extended, ruler flat frequency response from 10Hz?35kHz (0.2dB) with ultra-low distortion. The transformer isolates the input signal from the output signal, removing any DC noise. The Ground Lift switch disconnects the ground from the Input and Output connections which eliminates hum caused by ground loops. Roadworthy Construction Housed in a 14-gauge steel chassis, the MD1 is built to withstand the abuse of the most demanding live tours. Its rigid outer shell protects all the MD1?s internal connections, switches and solder joints from failure, ensuring quiet, reliable performance. Mono line isolation box eliminates hum and buzz caused by ground loops Samson STL transformer isolates input and output signals Flexible connectivity with 1/4" and XLR input and output connections Ruler flat frequency response from 10Hz?35kHz All-metal, impact resistant design Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.